T-SHAPED NODES FROM BENT PROFILES OF RECTANGULAR SECTION
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Abstract
Abstract: In article knots from bent profiles of the closed section are considered. The analysis of distribution of tension in knot elements for two constructive decisions with strengthening is made and without. The nature of destruction of knots is considered.
Subject: T-shaped node, in which the cross section of the crossbar was significantly smaller than the cross section of the rack. Two types of nodes were considered. The first type: with the adjoining of the crossbar to the through (without cutout) rack through a special plate. The second type: with a direct adjoining of the crossbar to the through rack and strengthening the node with two struts.
Materials and methods: The calculation of the stress-strain state of the models of the frame nodes was performed using the LIRA-CAD software package, the theoretical basis of which is the finite element method, implemented in the form of displacements.
Results: Based on the results of the calculation in the elastic stage, data were obtained on the distribution of longitudinal stresses in the most stressed sections of the assembly elements.
Conclusions: The results of the study of frame nodes showed that the destruction of the nodes occurred either due to the formation of cracks, or due to the loss of local stability by the plates of the nodes. The destruction of all nodes occurred after the formation of plastic zones, i.e. in the elastoplastic stage of the node operation. Also, the studies of nodes made it possible to evaluate the effectiveness of strengthening the nodes with various structural elements or their combinations.
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References
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